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Methanofullerene Blend Thin Flms



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ARTICLE IN PRESS Chemical Physics Letters 411 2005 138 143 www elsevier com locate cplett Absorption spectra modi cation in poly 3 hexylthiophene methanofullerene blend thin lms Vishal Shrotriya Jianyong Ouyang Ricky J Tseng Gang Li Yang Yang Department of Materials Science and Engineering University of California Los Angeles CA 90095 USA Received 15 April 2005 in nal form 8 June 2005 Abstract The absorption spectra and the photovoltaic e ect in thin lms consisting of a blend of p type poly 3 hexylthiophene and n type acceptor 6 6 phenyl C60 butyric acid methyl ester have been studied and a decrease in inter band absorption in the wavelength range of 450 600 nm is observed This absorption quenching is attributed to the disordering of the poly 3 hexylthiophene chains and a charge transfer between poly 3 hexylthiophene and 6 6 phenyl C60 butyric acid methyl ester as evidenced by FTIR and Xray photoelectron spectra Finally photovoltaic cells were fabricated utilizing the blend as the active layer and the device characteristics were studied 2005 Elsevier B V All rights reserved 1 Introduction Polymer based photovoltaic devices incorporating 3 D interpenetrating network of conjugated polymers and C60 derivatives have shown potential for application as renewable source of energy 1 There have been several e orts in last few years to improve the e ciencies of these devices and reach the levels where they can be put into practical applications 2 5 To further improve power conversion e ciency of the photovoltaic cells it is important to use high mobility polymers as the active material In terms of literature poly 3 hexylthiophene P3HT has the highest charge carrier mobility among the conjugated polymers and hole mobility as high as 0 1 cm2 V 1 s 1 has been reported 6 Moreover P3HT has a band gap of 1 9 2 0 eV which matches well with the strongest sun light 7 These merits render P3HT good candidate for the polymer in polymer photo Corresponding author Fax 1 310 825 3665 E mail



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